<html><head><title>PHP : Includes</title></head><body><?php include "nav.php";//to see how include_once includes file only once despite the repeatitive include of the same file //uncomment code below./*include "nav.php";//included 3 times, but doesn't includes anything since already includedinclude_once "nav.php";include_once "nav.php";include_once "nav.php";*/?><br/>this content is from body of blog.php. </body></html>